Ribbon disk for typewriters



May 2, 1950 1. e. H. VON KRAEMER 2,506,255

RIBBON DISK FOR TYPEWRITERS Filed'Feb. 2, 1946 IN VET NT 0 P Mm Gus'la} Hznn Von Kraemer WW ATTY'.

Patented May 2, 1 950 RIBBON DISK FOR TYPEWBITERS Ivan Gustaf Henry von Kraemer, Stockholm, Sweden Application February 2, 1946, Serial No. 645,091 In Sweden November 28, 1945 8 Claims.

This invention relates to the substitution of the writing-ribbon on a typewriter by a rotatable ribbon-disc. The ordinary typewriter ribbon is difficult to insert in the machine, some people finding it impossible to perform, and requiring assistance. It is expensive under ordinary usage, and due to these disadvantages there is a tendency to overuse the ribbon until the types have hammered it to rags, which tangle in the mechanism. Also the writing will sooner or later become indistinct, and will have empty spaces, and the ink will vanish, as it cannot be renewed.

My invention will overcome these objections by using a rotatable disc, which in one manipulation can be placed into position, or removed, the operation being so simple that any person, however unskilled, will be able to perform it.

As a result the complicated shifting mechanism, which easily becomes out of order, and which is used for pulling the ribbon from one side to another can be eliminated and the cost of manufacture of the typewriter can be considerably reduced. The ribbon-disc can be produced at a very low cost, and being made from any desirable resistant material, it will reduce the cost of typewriting to a considerable extent.

The invention is illustrated in the accompanying drawings, in which Fig. 1 is a side elevational View, and Fig. 2 is a top plan view.

On a thin disc I, made from brassor aluminum-plate, hard pasteboard or some other suitable material is glued, riveted or in some other way fastened a concentric, circular sheet, made from silk-cloth, nylon-fabric, rubber-sheet or other flexible but resistant material. This fabricsheet protrudes over the disc I, its outer edge running parallel with the periphery of the disc I and thus forming a ribbon l6, which is one of the main objects of the invention. The protruding concentric ribbon I6 is supplied with ink by a revolving inking-roller 8. The disc I is in its centre provided with a shaft, and on this shaft are pressed two flanges 2.

The part 6 is the modified sliding-fork, herein referred to as the ribbon-support used on the ordinary typewriter, serving to support and move the ink-ribbon up and down. Here it will serve to carry the disc I and move it up and down during writing. This part 6 is connected with a lever, and is operated up and down when any key is struck. It has a slot 9 in its middle and in this slot 9 the disc is lowered and kept in position by a. small spring l4, pressing over the shaft between the flanges 2.

Instead of the ink-ribbon on the ordinary typewriter, the concentric ribbon I6 is now moved up and down with each pressing of a type-key. On one part of the typewriter, supporting the pivots of the type bars, a rigid tongue 5 is fixed, intended as a guide or a carrier, on which the fork 6 is slidable up and down, small lugs at the edges of the tongue 5 being bent around onto the edges of the fork 6. In the centre of the tongue 5 is a slot i0 corresponding to the slot 9 in the fork. The slot H] is wider, to enable the shaft and its flanges to move freely.

On the disc I is fixed a concentric cog-wheel 3. At the lower part of the rigid metal-tongue 5 a pawl 4 is screwed on, its upper end pressing against the cog-wheel. For each depression of a type-key the disc I is moved up and down, and therefore the pawl 4 will cause the disc I to revolve.

The fork 6 has at one side an extended arm I intended to support the axis of the revolving inking-roller 8. This roller can be made in various ways, but its principle is to supply the ribbon with coloring matter.

On the upper end of the fork 6 two arms I I are fixed, and supplied with joint-members 63 connected through the joints l2. These arms and their jointed prolongations will serve to steady and guide the ribbon Hi. The joint-members H! are intended to be bent down on the offside of the ribbon it.

Having now described my invention with its principle fully explained, what I desire protected with Letters Patent is set forth in the following claims:

1. A typewriter comprising a rotatable disc, a resistant ribbon secured to one face of said disc concentric therewith and overlapping the periphery of said disc, vertically movable means for supporting said disc and ribbon, and means for rotating said disc in response to its vertical movement by said supporting means.

2. A typewriter according to claim 1, in which the said means for rotating said disc includes a cog wheel and pawl.

8. A typewriter according to claim 1, in which the said vertically movable supporting means is a vertically movable sliding fork.

4. A typewriter according to claim 3, in which said sliding fork has a plurality of fixed arms for supporting and guiding said ribbon.

5. A typewriter according to claim 1, in which said vertically movable supporting means is a sliding fork having a slot, and the said disc carries a rotatable shaft having annular flanges for guiding said disc in its movement into said slot.

6. A typewriter according to claim 5, including UNITED STATES PATENTS a spring carried by said sliding fork for maintaining the said disc in a fixed vertical position i fig g??? i with respecttothe Said 5101?. 355 413 Spiro Jam 4 13 7 7. A typewriter according to claim 6, including 5 522491 Raab July 1894 an inking roller rolling against said ribbon, and 1,9641) Antrim June 1934 means carried. by said sliding fork for supporting said inking roller. FOREIGN PATENTS 8. A typewriter according to claim '7, in which N b c t t the said means carried by said sliding fork com- 10 423,337 Germany of 1926 prises an arm. 114,488 Austria of 1929 IVAN GUSTAF HENRY VON KRAEMER.

REFERENCES CITED The following references are of record in the 5 file of this patent: 

